GSM firmware hacking

> But, there are other valid uses.
This reminds me that on some old Siemens mobile I once had, you could
get the IDs and signal strengths of all received base stations by typing
in some obscure key sequence. This would allow you to do a sort of lo-fi
location estimation (iPhone does that, too, I guess).
Or is it possible to get that information in some other way, without
directly messing with the baseband chip?
Yours, Florian
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